Pub Date : 2011-05-17DOI: 10.1109/CONATEL.2011.5958663
Patricia Castillo Aranibar, D. Segovia-Vargas, A. García-Lampérez, M. Salazar-Palma
This paper presents a microstrip diplexer for multisystem Distributed Antenna System (DAS) solutions, namely for DCS and UMTS systems. A low-pass quasi-elliptic filter with a stub-like structure is used for the 1800 MHz band while a band-pass Chebychev filter with a hairpin line structure is employed for the 2150 MHz band. Both filters are connected to the common port through a T junction. The diplexer layout has been optimized in order to ensure compactness. Good agreement between simulated and measured results has been obtained. The diplexer shows excellent performance in terms of high isolation and low insertion loss. A semi-lumped element model of the diplexer is also presented.
{"title":"Design of a compact diplexer for multisystem DAS solutions","authors":"Patricia Castillo Aranibar, D. Segovia-Vargas, A. García-Lampérez, M. Salazar-Palma","doi":"10.1109/CONATEL.2011.5958663","DOIUrl":"https://doi.org/10.1109/CONATEL.2011.5958663","url":null,"abstract":"This paper presents a microstrip diplexer for multisystem Distributed Antenna System (DAS) solutions, namely for DCS and UMTS systems. A low-pass quasi-elliptic filter with a stub-like structure is used for the 1800 MHz band while a band-pass Chebychev filter with a hairpin line structure is employed for the 2150 MHz band. Both filters are connected to the common port through a T junction. The diplexer layout has been optimized in order to ensure compactness. Good agreement between simulated and measured results has been obtained. The diplexer shows excellent performance in terms of high isolation and low insertion loss. A semi-lumped element model of the diplexer is also presented.","PeriodicalId":197632,"journal":{"name":"CONATEL 2011","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121864548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-17DOI: 10.1109/CONATEL.2011.5958669
C. Peixeiro
A preliminary approach for the analysis and design of patch antennas located over biological tissues is presented. The study is performed in the 2.4 GHz ISM band envisaging body area and personal area network applications. A moment method numerical analysis is used to check the effects of the biological tissues on the patch antenna performance. Both single patches and two element arrays are analyzed. The conclusions obtained can be used as guidelines to conduct a more accurate approach where the complete model of the human body (shape and size) is taken into account.
{"title":"Patch antennas for BAN/PAN applications at 2.45 GHz: A preliminary approach","authors":"C. Peixeiro","doi":"10.1109/CONATEL.2011.5958669","DOIUrl":"https://doi.org/10.1109/CONATEL.2011.5958669","url":null,"abstract":"A preliminary approach for the analysis and design of patch antennas located over biological tissues is presented. The study is performed in the 2.4 GHz ISM band envisaging body area and personal area network applications. A moment method numerical analysis is used to check the effects of the biological tissues on the patch antenna performance. Both single patches and two element arrays are analyzed. The conclusions obtained can be used as guidelines to conduct a more accurate approach where the complete model of the human body (shape and size) is taken into account.","PeriodicalId":197632,"journal":{"name":"CONATEL 2011","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133244530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-01DOI: 10.1109/CONATEL.2011.5958666
Ana Belén Mejía-Ocaña, Manuel de-Frutos-López, S. Sanz-Rodriguez, Oscar del-Ama-Esteban, Carmen Peláez-Moreno, F. Díaz-de-María
In this paper, a low-complexity motion-based saliency map estimation method for perceptual video coding is proposed. The method employs a camera motion compensated vector map computed by means of a hierarchical motion estimation (HME) procedure and a Restricted Affine Transformation (RAT)-based modeling of the camera motion. To allow for a computationally efficient solution, the number of layers of the HME has been restricted and the potential unreliable motion vectors due to homogeneous regions have been detected and specially managed by means of a smooth block detector. Special care has been taken of the smoothness of the resulting compensated camera motion vector map to avoid unpleasant artifacts in the perceptually-coded sequence, by including a final post-processing based on morphological filtering. The proposed saliency map has been both visually and subjectively assessed showing quality improvements when used as a part of the H.264/AVC standard codec at medium-to-low bitrates.
{"title":"Low-complexity motion-based saliency map estimation for perceptual video coding","authors":"Ana Belén Mejía-Ocaña, Manuel de-Frutos-López, S. Sanz-Rodriguez, Oscar del-Ama-Esteban, Carmen Peláez-Moreno, F. Díaz-de-María","doi":"10.1109/CONATEL.2011.5958666","DOIUrl":"https://doi.org/10.1109/CONATEL.2011.5958666","url":null,"abstract":"In this paper, a low-complexity motion-based saliency map estimation method for perceptual video coding is proposed. The method employs a camera motion compensated vector map computed by means of a hierarchical motion estimation (HME) procedure and a Restricted Affine Transformation (RAT)-based modeling of the camera motion. To allow for a computationally efficient solution, the number of layers of the HME has been restricted and the potential unreliable motion vectors due to homogeneous regions have been detected and specially managed by means of a smooth block detector. Special care has been taken of the smoothness of the resulting compensated camera motion vector map to avoid unpleasant artifacts in the perceptually-coded sequence, by including a final post-processing based on morphological filtering. The proposed saliency map has been both visually and subjectively assessed showing quality improvements when used as a part of the H.264/AVC standard codec at medium-to-low bitrates.","PeriodicalId":197632,"journal":{"name":"CONATEL 2011","volume":"412 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120879704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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